Vista normal Vista MARC

Slash-and-burn effects on fine root biomass and productivity in a tropical dry forest ecosystem in Mexico

Castellanos Albores, Jorge | Jaramillo, Víctor J [autor/a] | Sanford, Robert L [autor/a] | Kauffman, J. Boone [autor/a].
Tipo de material: Artículo impreso(a) Artículo impreso(a) Tema(s): Biomasa forestal | Incendios forestales | Bosques tropicales secosTema(s) en inglés: Forest biomass | Forest fires | Tropical dry forestDescriptor(es) geográficos: San Mateo, La Huerta (Jalisco, México) | Estación de Biología Chamela (Jalisco, México) Clasificación: AR/634.928097235 / S5 Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Forest Ecology and Management. volumen 148, número 1-3 (July 2001), páginas 41-50. --ISSN: 0378-1127Número de sistema: 52224Resumen:
Inglés

We examined the effects of slash-and-burn of a tropical dry forest (TDF) and pasture establishment on fine root (≤1 mm) biomass and productivity. We also determined the seasonal changes of fine roots. The study was conducted in the coast of Jalisco, México where the dominant vegetation is tropical dry forest. Two 33 m×100 m experimental plots with undisturbed TDF were slashed-and-burned by local farmers. Two adjacent plots with TDF were established as control sites. After slash-and-burning of the experimental plots, these were seeded with three pasture grasses along with two local maize varieties. Root sampling was initiated in March 1993 and roots were collected monthly until February 1994. Eight soil samples were collected randomly in each plot at each sampling date to a depth of 10 cm with a soil corer. Each soil core was divided in three depths: 0-2, 2.1-5, and 5-10 cm. Roots were separated in two size categories: fine (≤1.0 mm) and small (1.1-5 mm). Fine roots were separated into live and dead. Productivity of fine roots for each depth was estimated from the biomass data. Live fine root biomass in the 0-10 cm profile decreased due to burning but 47% of the fine root mass loss was at the 0-2 cm depth. Dead fine root biomass diminished significantly only at this depth.

Total fine root productivity and mortality was 42-45% higher in TDF than in pasture in the first 5 cm of soil. About 86 and 76% of the fine root productivity in TDF and pasture, respectively, occurred in the first 5 cm of soil. Fine root turnover rates were high and similar in both ecosystems. Live fine root biomass in TDF and pasture increased in response to rainfall, particularly in the first 5 cm of soil. Mean annual live fine root biomass was significantly greater in TDF than in pasture only at the 0-2 cm depth. Mean biomass per cm of soil was greater in the first 2 cm of the profile in both TDF and pasture and it represented one-third of the fine root biomass in the 0-10 cm profile. There were no significant differences of small roots (1.1-5.0 mm in diameter) due to treatment, seasonality or dynamics. Based on root turnover and root production, our results indicate that the relative importance of belowground processes for C supply to the soil in this TDF is greater than the aboveground return.
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
Star ratings
    Valoración media: 0.0 (0 votos)
Existencias
Tipo de ítem Biblioteca actual Colección Signatura Info Vol Estado Fecha de vencimiento Código de barras
Artículos Biblioteca Electrónica
Recursos en línea (RE) 		ECOSUR Recurso digital ECO400522244600
Artículos Biblioteca San Cristóbal

Texto en la configuración de la biblioteca San Cristóbal

Artículos (AR) 		ECOSUR AR 634.928097235 S5 001 Disponible ECO010015516

Disponible para usuarios de ECOSUR con su clave de acceso

We examined the effects of slash-and-burn of a tropical dry forest (TDF) and pasture establishment on fine root (≤1 mm) biomass and productivity. We also determined the seasonal changes of fine roots. The study was conducted in the coast of Jalisco, México where the dominant vegetation is tropical dry forest. Two 33 m×100 m experimental plots with undisturbed TDF were slashed-and-burned by local farmers. Two adjacent plots with TDF were established as control sites. After slash-and-burning of the experimental plots, these were seeded with three pasture grasses along with two local maize varieties. Root sampling was initiated in March 1993 and roots were collected monthly until February 1994. Eight soil samples were collected randomly in each plot at each sampling date to a depth of 10 cm with a soil corer. Each soil core was divided in three depths: 0-2, 2.1-5, and 5-10 cm. Roots were separated in two size categories: fine (≤1.0 mm) and small (1.1-5 mm). Fine roots were separated into live and dead. Productivity of fine roots for each depth was estimated from the biomass data. Live fine root biomass in the 0-10 cm profile decreased due to burning but 47% of the fine root mass loss was at the 0-2 cm depth. Dead fine root biomass diminished significantly only at this depth. eng

Total fine root productivity and mortality was 42-45% higher in TDF than in pasture in the first 5 cm of soil. About 86 and 76% of the fine root productivity in TDF and pasture, respectively, occurred in the first 5 cm of soil. Fine root turnover rates were high and similar in both ecosystems. Live fine root biomass in TDF and pasture increased in response to rainfall, particularly in the first 5 cm of soil. Mean annual live fine root biomass was significantly greater in TDF than in pasture only at the 0-2 cm depth. Mean biomass per cm of soil was greater in the first 2 cm of the profile in both TDF and pasture and it represented one-third of the fine root biomass in the 0-10 cm profile. There were no significant differences of small roots (1.1-5.0 mm in diameter) due to treatment, seasonality or dynamics. Based on root turnover and root production, our results indicate that the relative importance of belowground processes for C supply to the soil in this TDF is greater than the aboveground return. eng

Disponible en línea

Adobe Acrobat profesional 6.0 o superior

Con tecnología Koha